The Moddo Pinch could fit into your tiniest DIY projects.

The Demo AssyDemo is an Arduino Project for a Arduino with a AtMega328(P)(B) chip, so it also works with the Elektor Arduino R4 board. These boards are still popular for builders of DCC Function ...

Raspberry Pi Pico's built-in bootloader allows you to write firmware via USB or SWD. However, in some situations, other interfaces may be useful. Picoboot3 now offers the options of UART, I2C and SPI.